I looked into them but did not purchase from them. Doing a few rehabs in the Milwaukee area, I'm sure you are familiar with HOBO. HOBO had a better selection, had features that were an upgrade on the base cabinets from Cabinets to Go (dovetail joints on the drawers) and were a good $700 less not counting the additional 15% off (I had the good fortune to buy while a sale was going on.) Mind you these were the basic cabinets each store offered.
I have heard they are a good value if you go with the higher end stuff they offer, but I did not get the impression they had a lot of selection even on those products, so you are somewhat limited to what they can offer. Perhaps the store I visited was not typical, but for a store that caters to basically cabinets and vanities I felt wanting more choice. By comparison, Home Depot (and HOBO where available) has a myriad of door style, wood, and color choices; albeit a lot of it special order. I'm sure some higher end kitchen and bath outfits can do the same. Only you can be sure what you're looking for, so maybe you'd want to check them out.